JSON for Modern C++ 3.8.0

accept
accept
accept
allocator_type
array
array_t
at
at
at
at
at
at
back
back
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
begin
begin
binary
binary
binary
binary
binary_t
boolean_t
cbegin
cend
clear
const_iterator
const_pointer
const_reference
const_reverse_iterator
contains
contains
count
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crend
detail::external_constructor
diff
difference_type
dump
emplace
emplace_back
empty
end
end
erase
erase
erase
erase
error_handler_t
exception
find
find
flatten
from_bson
from_bson
from_bson
from_bson
from_cbor
from_cbor
from_cbor
from_cbor
from_msgpack
from_msgpack
from_msgpack
from_msgpack
from_ubjson
from_ubjson
from_ubjson
from_ubjson
front
front
get
get
get
get
get
get
get_allocator
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get_binary
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get_ptr
get_ref
get_ref
get_to
get_to
initializer_list_t
input_format_t
insert
insert
insert
insert
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insert
insert_iterator
invalid_iterator
is_array
is_binary
is_boolean
is_discarded
is_null
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is_number_integer
is_number_unsigned
is_object
is_primitive
is_string
is_structured
items
items
iterator
iterator_wrapper
iterator_wrapper
json_pointer
json_sax_t
json_serializer
max_size
merge_patch
meta
number_float_t
number_integer_t
number_unsigned_t
object
object_comparator_t
object_t
operator value_t
operator ValueType
operator!=
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operator[]
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operator[]
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operator[]
operator[]
operator[]
other_error
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parse
parse
parse
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parse_event_t
parser_callback_t
patch
pointer
push_back
push_back
push_back
push_back
rbegin
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reference
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rend
reverse_iterator
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sax_parse
sax_parse
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size_type
string_t
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to_bson
to_bson
to_bson
to_cbor
to_cbor
to_cbor
to_msgpack
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to_msgpack
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type
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~basic_json
| ## ◆ is_structured()
constexpr bool nlohmann::basic_json::is_structured | ( |  | ) | const
| inline constexpr noexcept
  This function returns true if and only if the JSON type is structured (array or object). Returns `true` if type is structured (array or object), `false` otherwise. Complexity Constant. Exception safety No-throw guarantee: this member function never throws exceptions. Example The following code exemplifies `is_structured()` for all JSON types. 1 #include <iostream> 2 #include <nlohmann/json.hpp> 3 4 using json = nlohmann::json; 5 6 int main() 7 { 8 // create JSON values 9 json j_null; 10 json j_boolean = true; 11 json j_number_integer = 17; 12 json j_number_float = 23.42; 13 json j_number_unsigned_integer = 12345678987654321u; 14 json j_object = {{"one", 1}, {"two", 2}}; 15 json j_array = {1, 2, 4, 8, 16}; 16 json j_string = "Hello, world"; 17 json j_binary = json::binary({1, 2, 3}); 18 19 // call is_structured() 20 std::cout << std::boolalpha; 21 std::cout << j_null.is_structured() << '\n'; 22 std::cout << j_boolean.is_structured() << '\n'; 23 std::cout << j_number_integer.is_structured() << '\n'; 24 std::cout << j_number_unsigned_integer.is_structured() << '\n'; 25 std::cout << j_number_float.is_structured() << '\n'; 26 std::cout << j_object.is_structured() << '\n'; 27 std::cout << j_array.is_structured() << '\n'; 28 std::cout << j_string.is_structured() << '\n'; 29 std::cout << j_binary.is_structured() << '\n'; 30 } Output (play with this example online):
      false
      false
      false
      false
      false
      true
      true
      false
      false
  The example code above can be translated with
      g++ -std=c++11 -Isingle_include doc/examples/is_structured.cpp -o is_structured
See also is_primitive() – returns whether value is primitive is_array() – returns whether value is an array is_object() – returns whether value is an object Since version 1.0.0 Definition at line 18158 of file json.hpp.

nlohmann::basic_json::binary
static basic_json binary(const typename binary_t::container_type &init)
explicitly create a binary array (without subtype)
Definition: json.hpp:17456
nlohmann::basic_json::is_structured
constexpr bool is_structured() const noexcept
return whether type is structured
Definition: json.hpp:18158
nlohmann::json
basic_json<> json
default JSON class
Definition: json.hpp:2774